How Do You Fix This Code Snippet to Make It

Multiple Choice

How do you fix this code snippet to make it print out the sum when the user enters a letter rather than a double? The user must enter at least one double when the program begins.

A) while (in.hasData() ) ;
B) while (!in.hasEnded() ) ;
C) while (in.hasNextDouble() ) ;
D) while (hasData) ;